Synthesis and formation mechanism of amorphous silica particles via sol–gel process with tetraethylorthosilicate

A sol-gel process was used to prepare polyimide-silica hybrid films from the polyimide precursors and TEOS in N,N- dimethyl acetamide, then the hybrid film was treated with hydrofluoric acid to remove the dispersed silica particles, leaving pores with diameters between 80nm to 1µm, depending on the size of silica particles. The structure and dielectric constant of the hybrid and porous films were characterized by FTIR,SEM. The porous films displayed relatively low dielectric constant compared to the hybrid polyimide-silica films.

Download Full-text

Surface functionalized colloidal silica particles from an inverse microemulsion sol gel process

Journal of Inorganic and Organometallic Polymers ◽

10.1007/bf01193062 ◽

1995 ◽

Vol 5 (4) ◽

pp. 391-407 ◽

Cited By ~ 5

Author(s):

P. Espiard ◽

A. Guyot ◽

J. E. Mark

Keyword(s):

Colloidal Silica ◽

Sol Gel ◽

Silica Particles ◽

Sol Gel Process ◽

Inverse Microemulsion

Download Full-text

Microencapsulation of an acrylate monomer in silica particles by sol–gel process

Journal of Sol-Gel Science and Technology ◽

10.1007/s10971-010-2337-z ◽

2010 ◽

Vol 57 (2) ◽

pp. 164-171 ◽

Cited By ~ 5

Author(s):

Cristina Lavinia Nistor ◽

Dan Donescu ◽

Alain Perichaud ◽

Wael Ballout ◽

Marius Ghiurea

Keyword(s):

Sol Gel ◽

Silica Particles ◽

Acrylate Monomer ◽

Sol Gel Process

Download Full-text

Structural Colors Based on Amorphous Arrays Comprised Solely of Silica Particles

Applied Sciences ◽

10.3390/app10010420 ◽

2020 ◽

Vol 10 (1) ◽

pp. 420

Author(s):

Dae-San Choi ◽

Ju-Hwan Choi ◽

Chang-Yull Lee

Keyword(s):

Phenol Formaldehyde ◽

Sol Gel ◽

Silica Particles ◽

Phenol Formaldehyde Resin ◽

Formaldehyde Resin ◽

Structural Colors ◽

Convection Oven ◽

Sol Gel Process ◽

One Step ◽

The Stöber Method

In this study, structural colors were fabricated by producing an amorphous array with atypical silica particles. The colors were controlled by an array of silica particles with different sizes. In previous research, the process required inducement of the amorphous array, which was complex. Meanwhile, in this paper, we proposed a simple one-step process. First, spherical silica nanoparticles were synthesized using the sol-gel process of the Stöber method. Atypical silica particles that induced an amorphous array were produced by adding a small amount of phenol-formaldehyde resin. Subsequently, the colloidal silica was converted to a powder using a convection oven. The characteristics of the synthesized silica particles were confirmed using a scanning electron microscope (SEM). All the synthesized silica powders obtained structural colors. Finally, the silica powders were dispersed in deionized (DI) water and coated on a glass slide. We confirmed that the silica particles showed different structural colors depending on the size of the particles. We also found that the color was highly independent of the viewing angle.

Download Full-text